1. Brazilian Hospital Services Company — Climério de Oliveira Maternity Hospital, Health Regulation and Evaluation Sector, Salvador, Bahia, Brazil
2. Federal University of Recôncavo Baiano Exact and Technological Sciences Center, Cruz das Almas, Bahia, Brazil
3. State University of Feira de Santana, Bahia, Brazil
4. Applied Statistics Program, Jorge Amado University Center, Bahia, Brazil
5. Polytechnic Institute of Setúbal, Setúbal, Portugal